There is a big difference between hypersensitization and latensification. Hypersensitizing a film is done before and latensification is done after exposure. Some authors either equate or confuse the two. The mechanism for the two processes is different. However, the same chemicals hydrogen peroxide, mercury, sulfur dioxide, etc may be involved. For the average photographer the processes are a curiousity and more bother than it is worth. This is why only astronomers use these technoques because they must.
For those who insist on trying hypersenitization the easiest method is exposure to a very dim green light for an extended period of time. The method most often described is the use of a Kodak Brownie safelight with the green cup. A 7 watt bulb is used and half of the cup is covered with black tape. IIRC, the film is exposed at a distance of 8 to 10 feet for a period of several minutes. Afterwards the film is respooled for use. As I mentioned before every film is different and the method must be tweeked for each film.
Ok but that doesn't really matter. the OPQ was about H2O2 steaming which is done after development, before fixing and, as you would put it, is a latensification method.
Last edited by Soeren; 02-21-2013 at 02:11 AM. Click to view previous post history.
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